PHILADELPHIA -- Police say a man died of a heart attack amid a massive brawl that broke out between people attending two different wedding receptions in downtown Philadelphia.

The incident happened early Sunday morning at a hotel in the Society Hill section when fighting broke out among dozens of people attending the receptions. Police say a 57-year-old guest suffered a fatal heart attack outside the reception, but they don't know if he was involved in any of the fights.

Dozens of people were involved in the altercations and police arrested three people; at least one man was subdued with a stun gun.

Police say they don't know what started the brawl, but that alcohol was involved. Investigators haven't released any of the names of those involved.